Codebase Snapshot Mapper (Repo Scan → Module Map → 30-Minute Onboarding Brief)
Quickly turn any GitHub repo into a 1-page architecture map with entry points, modules, key dependencies, and learning priorities for fast onboarding.
Prompt Overview
Tips For You
- Paste a trimmed file tree from VS Code’s copy path feature. - Include package.json or pyproject.toml to infer scripts and tooling. - Add one sample endpoint or command to improve entry flow accuracy.
From Operations TeamNexusAi TechnologyProblem It Solves
New contributors lose hours figuring out where execution starts, how modules relate, and which files matter. This prompt creates a crisp map and starter brief so you can navigate with confidence.
Rapid Entry-Point Detection
Identifies how the app boots and where execution begins.
Module Responsibility Map
Summarizes major folders and their roles in one page.
Dependency Insight
Surfaces critical libraries and why they matter.
Timeboxed Onboarding Plan
Gives a 30-minute, five-step starter plan.
AI Prompt Instructions
Act as an experienced software architect and onboarding mentor.
Why this task matters:
New contributors waste time hunting for entry points, core modules, and conventions. A clear snapshot shortens time-to-first-commit and reduces mistakes.
Important boundaries:
- Do not make up code; base insights on the provided tree, README, and selected files.
- Call out uncertainty and list files to inspect next if evidence is incomplete.
User inputs:
- Repository name, purpose, and dominant language/framework.
- Key files: README, package/lock files, main app/server entry, routing config, module folders, tests.
- High-level goals (e.g., onboarding, bug triage, feature addition).
Objectives:
1) Identify primary entry points and execution flow.
2) Outline major modules, responsibilities, and data flow.
3) Highlight dependencies, config, scripts, and common utilities.
4) Flag complexity hotspots and immediate learning priorities.
Analysis workflow:
1) Parse README for project goals, setup, run commands.
2) Inspect dependency files to infer build, run, test pipelines.
3) Map entry points (e.g., main.ts, index.js, app.py) and routing.
4) Group files into functional areas; summarize each in one sentence.
5) Note cross-cutting concerns (auth, logging, error handling, state mgmt).
6) Identify top 5 files/folders to read in order.
Required output format:
- One-paragraph overview.
- Architecture map: bullet list of modules → role → key files.
- Entry points and request/CLI flow summary.
- Top dependencies and why they matter.
- Complexity hotspots and risk notes.
- 30-minute onboarding plan (5 steps, timeboxed).
Quality controls:
- Use precise filenames and paths.
- Separate facts from assumptions; mark assumptions clearly.
Verification checklist:
- Entry point identified.
- At least 5 modules or folders mapped.
- Run/test commands captured.
- Learning priorities ranked.
Final instruction:
Produce a concise, skimmable 1-page brief suitable for a new developer’s first 30 minutes.
Expected Outcome
Overview: Web API for task management using Node.js + Express. Architecture Map: - server/: Express app bootstrap (server/index.js) - routes/: HTTP endpoints (routes/tasks.js) - controllers/: Request orchestration (controllers/taskController.js) - models/: Data access via Sequelize (models/task.js) - middleware/: Auth/logging (middleware/auth.js) Entry Flow: npm run start → server/index.js → routes → controllers → models. Top Dependencies: express, sequelize, jsonwebtoken. Hotspots: auth middleware complexity, tasks controller size. 30-Minute Plan: 1) Skim README (3m) 2) Open server/index.js (5m) 3) Trace GET /tasks (7m) 4) Review auth middleware (7m) 5) Run tests (8m).
Implementation Journey
Generate the snapshot in ChatGPT
Open ChatGPT. Paste the repo README, a trimmed file tree, and key files (entry point, routing, config). Ask for a 1-page architecture map and 30-minute onboarding plan using this prompt. Expect a module list, entry flow, and top learning priorities.
10 minVerify in VS Code against the repo
Open the repo in VS Code. Jump to each listed file/path and confirm roles. Adjust the module names if the structure differs. Run the documented start/test scripts to validate entry points and test coverage.
10 minPublish as a team onboarding note
Create a short document in your knowledge base or repo wiki with the snapshot, links to the files, and the 30-minute plan. Pin it in the repo README for new contributors.
10 min